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International Heat Transfer Conference 12

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)

Numerical and experimental study of thermal stratification of coolant in nuclear power plant pipe-lines

V. K. Artemyev
State Scientific Centre of Russian Federation, Institute of Physics and Power Engineering, Bondarenko sq. 1, Obninsk, Kaluga region, Russia, 249020

L. Krylova
Institute of Physics and Power Engineering (IPPE), State Scientific Center of Russian Federation, Bondarenko Sq.1, Obninsk, Kaluga Region, Russia, 249033

A. N. Opanasenko
Institute of Physics and Power Engineering (IPPE), State Scientific Center of Russian Federation, Bondarenko Sq.1, Obninsk, Kaluga Region, Russia, 249033

DOI: 10.1615/IHTC12.3770
6 pages

Abstract

Phenomena of coolant thermal stratification belong to the complicated and insufficiently investigated division of technical thermohydraulics. Thermal fatigue due to big and sharp temperature differences, which are inherent to a thermal stratification, causes a number of serious problems in the design of any mechanical component. Study of temperature stratification of coolant flow in piping is important for safety and reliability of nuclear power plants (NPP) (Schulz, 1998), (Opanasenko, 1998). A number of incidents at NPP with different pressurized and boiling water reactors made this problem very actual. The set of experimental and numerical results for cold pipeline model of WWER reactor (russian pressurized water type reactor) are presented. Appearance of thermal stratification conditions due to different temperatures in separate pipelines arising from emergency core cooling system is considered. The critical Froude number (Fr) at which the thermal stratification occurs is determined, hydrodynamics and thermal flow characteristics, its stability are investigated and dependences for hot fluid wedge are obtained. Numerical simulation of mixed convection is performed on the base of the Navier-Stokes equations. Implicit numerical method is employed (Artemyev, 1998). Results of numerical predictions and comparison with experimental data are presented.

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